Synthesis and modification of calcium carbonate nano-particles via reverse micro-emulsion method
by Aboutaleb Ghadami Jadval Ghadam; Mohammad Idrees; S. Alim Husain Naqvi
International Journal of Nano and Biomaterials (IJNBM), Vol. 5, No. 1, 2014

Abstract: Two reverse microemulsion system of surfactants (Span^®80 and Tween^®80)/Toluene/water was selected for synthesis of CaCO₃ nano-particles. CaCO₃ particles synthesised were surface modified by stearic acid. The effect of different concentrations of surfactants (span-80/tween-80) on the synthesis of nano-CaCO₃ was investigated. The material was characterised by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA/DTA) techniques. XRD patterns confirmed spherical structure of nano-CaCO₃ showing characteristic reflection of calcite phase. The size of the nano-particles was determined by TEM as well as XRD data for various concentrations of surfactants. The results showed that the size of the nano-particles was influenced by the concentration of the surfactants in the micro-emulsion system. TGA results demonstrated that decreasing the size of nano-particles resulted in the weight loss: these thermal decompositions may be attributed to calcite.

Online publication date: Mon, 30-Jun-2014

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